Effect of Linearity Enhancement in A/D Conversion for Single Carrier Transmission Systems

Analog-to-digital (A/D) converter (ADC) and related analog hardware designs are important factors to simplify the transceiver circuits in wireless communication systems. In order to mitigate the nonlinearity of a low-resolution ADC that reduces the required analog hardware complexity, we have investigated two nonlinearity mitigation techniques for A/D conversion, i.e., the dither-ADC and the hysteresis-ADC. In this paper, we evaluate the effect of the nonlinearity mitigated A/D conversion techniques on the achievable performance in single carrier offset-quadrature-amplitude-modulation (OQAM)and QAM systems, where the receiver adopts either the dither-ADC or the hysteresis-ADC. Simulation results prove that both the dither-ADC and the hysteresis-ADC are effective in improving BER performance of both OQAM and QAM systems affected by the nonlinearity of ADC, while the transmitter employs a selected mapping technique that achieves a low peak-to-average power ratio (PAPR).